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	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#程序计数器
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#java-虚拟机栈
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	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#本地方法栈
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#堆
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/pictures/java%E5%86%85%E5%AD%98%E5%8C%BA%E5%9F%9F/hotspot-heap-structure.png
issue552	https://github.com/Snailclimb/JavaGuide/issues/552
Default Java 8 max heap size	https://stackoverflow.com/questions/28272923/default-xmxsize-in-java-8-max-heap-size
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#方法区
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	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#运行时常量池
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#字符串常量池
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/pictures/java%E5%86%85%E5%AD%98%E5%8C%BA%E5%9F%9F/method-area-jdk1.6.png
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JVM 常量池中存储的是对象还是引用呢？ - RednaxelaFX - 知乎	https://www.zhihu.com/question/57109429/answer/151717241
《深入理解 Java 虚拟机（第 3 版）》样例代码&勘误	https://github.com/fenixsoft/jvm_book
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	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#直接内存
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	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#step1类加载检查
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#step2分配内存
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#step3初始化零值
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#step4设置对象头
	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#step5执行-init-方法
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	https://github.com/algorithm004-04/JavaGuide/blob/main/docs/java/jvm/memory-area.md#参考
https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html	https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html
https://chenxitag.com/archives/368	https://chenxitag.com/archives/368
https://www.zhihu.com/question/55994121/answer/147296098	https://www.zhihu.com/question/55994121/answer/147296098
https://www.zhihu.com/question/57109429/answer/151717241	https://www.zhihu.com/question/57109429/answer/151717241
http://www.pointsoftware.ch/en/under-the-hood-runtime-data-areas-javas-memory-model/	http://www.pointsoftware.ch/en/under-the-hood-runtime-data-areas-javas-memory-model/
https://dzone.com/articles/jvm-permgen-%E2%80%93-where-art-thou	https://dzone.com/articles/jvm-permgen-%E2%80%93-where-art-thou
https://stackoverflow.com/questions/9095748/method-area-and-permgen	https://stackoverflow.com/questions/9095748/method-area-and-permgen
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